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Neuron - PowerPoint PPT Presentation

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Neuron. Neurons. How do biological processes relate to behavior?. Neurons : the communicators of the nervous system. Transmitting signals. Fluids containing positively charged ions (NA+) (K+) and negatively charged ions ( Cl -) are constantly passing through the cell membrane

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How do biological processes relate to behavior?

transmitting signals
Transmitting signals
  • Fluids containing positively charged ions (NA+) (K+) and negatively charged ions (Cl-) are constantly passing through the cell membrane
  • Inactive neuron has more negative inside than outside
    • this creates a store of energy called resting potential
transmitting signals cont
Transmitting signals cont.
  • When the cell is stimulated it lets in positively charged sodium ions.
    • This creates action potential
    • Short-lived charge
    • Sends information down the axon to the axon terminals
transmitting signals cont1
Transmitting signals cont.
  • After the action potential zooms down the axon, the channels in the membrane close.
    • No more sodium can get in.
  • They remain closed for a short amount of time and no impulses can fire
    • This is called the refractory period
all or none
  • The neuron either fires or it doesn’t
  • Neurotransmitters cross the synaptic gap
  • When the action potential reaches the terminal buttons, the neurotransmitters are released.
  • Bind to receptor sites
    • Like keys
    • Extra neurotransmitter is returned to the cell (reuptake)
transmitting signal
Transmitting signal
  • Excitatory response (+charge) –depolarization
    • Action potential likely
  • Inhibitory response (- charge) –hyperpolarization
    • Action potential unlikely
  • If the voltage changes enough to reach threshold, the neuron will fire.
sodium potassium pump
Sodium Potassium pump
  • To get ready for another action potential, Na+ needs to be pumped out and K+ needs to be pumped in.